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Turbine shaft seal with spring arrangement

Publishing Venue

The IP.com Prior Art Database

Abstract

A turbine shaft seal arrangement comprises a semi-circular spring extending circumferentially between the turbine casing and a shaft seal. It allows the shaft seal to move away from the shaft during low-pressure conditions in order to avoid damage. When the spring force is overcome with increasing pressure in the turbine the semi-circular spring is forced to move radially inward and assume a shape having several waves along its length. The spring is kept in contact with the seal by several pins or similar devices. The ends of the semi-circular spring are fixed by means of a stop plate arranged in the vicinity of the horizontal casing flanges of the turbine casing.

Copyright

Colin R. Woodward, ALSTOM (UK) Ltd, 2005

Country

United Kingdom

Language

English (United States)

This text was extracted from a Microsoft Word document.

At least one non-text object (such as an image or picture) has been suppressed.

This is the abbreviated version, containing approximately
52% of the total text.

Turbine shaft seal with spring arrangement

Rotating
machinery such as steam turbines typically comprise labyrinth seals about their
shaft in order to minimise leakage flows between static and rotating parts.
Excursions from normal concentric running can occur at low-pressure conditions.
Accordingly, the seals are designed to spring back away from the shaft in order
to reduce damage to the seal and shaft. For this, known springs are designed
either as individual plate springs arranged spaced regularly about the
circumference or as radially mounted coil springs as disclosed for example in
US 3,594,010. Other known labyrinth seals are spring loaded away from the shaft
during low-pressure conditions as disclosed for example in US patent 5,934,684.
Should the pressure load overcome the spring force, the seal moves to a running
position on the rotor.

A
new solution to avoid damage to shaft and seal is presented. It comprises
semi-circular springs, instead of coil or plate springs, that extend
circumferentially between the casing and a shaft seal and allow the seal to
move away from the shaft during low-pressure conditions. Figure 1 shows the
lower half of a turbine casing, the turbine rotor, and three segments of a
labyrinth seal extending along the circumference of the casing between the
casing and the rotor. The hatched area extending over the entire extent of the
three seal segments indicate the position of the semi-circular spring S1. Several pins or similar devices give a point
contact between the semi-circular spring and each seal segment and are plac...